I have a high idle due to the computer keeping the Idle Air Control valve staying open letting the air go past the MAF sensor. I have smoke tested the car with my home made smoke maker. After getting the engine warm the IAC valve still lets air in bypassing the MAF sensor. I put a new IAC valve just to make sure it wasn't the valve. A wells youtube diagnostic video showed the 4 wire connector giving off electricity on all of the connectors when the engine was running. At warm engine mine shows the two outside wires of the connector as hot but not the two inner ones. I have an older 90's diagram in my Chiltons showing the 4 wires. Would this be good enough for my testing? It shows the wire going from the harness all the way back to the computer. I was wondering if I should test for continuity on the two blank wires all the way back to the computer. I don't see a harness where I could test them midway. Anyone have an electrical diagram more up to date than mine? I was thinking of going to alldata with a subscription for the wiring diagram. Also my MAF sensor reads 5 to 5.5 g/sec. Isn't that a high reading? Unfortunately it is an older Autozone sensor not AC Delco. I have no codes now (had a single P0507) but have a high long term fuel trim (16) due to the IAC being open. I need the car smogged in the next 3 weeks so any suggestion would be helpful.